We have done all the hard work and spent a lot of money in research for you and these parts that I am now selling are the best and will be the right type of upgrade that will give you the best benefits.
This cylinder is the 1 to 1 size
Less friction on your o'ring means more RPS ... Less wear ... lighter and lets face it it looks shit hot!
YOU ARE BUYING:
# M4A1 Stainless Steel Polished Cylinder